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    <p>Here is my own version inspired by James' one. You can enable / disable tristate to get a classic checkbox with the same component, and the mechanism used is a bit different, with less boilerplate. Embedded picture is <a href="http://imgur.com/fMsjBOE" rel="nofollow">here</a>. Use at your own risks ! :)</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;s:Group xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark" xmlns:mx="library://ns.adobe.com/flex/mx" creationComplete="init()"&gt; &lt;fx:Script&gt; &lt;![CDATA[ import mx.events.FlexEvent; // STATES : /** The intermediate state value. */ public static const INTERMEDIATE:int = -1; /** The unchecked state value. */ public static const UNCHECKED:int = 0; /** The checked state value. */ public static const CHECKED:int = 1; // TRISTATE : private var _isTristate:Boolean; /** Whether this checkbox is tristate or a normal checkbox. */ [Bindable] public function get isTristate():Boolean { return _isTristate; } public function set isTristate(value:Boolean):void { _isTristate = value; if(!_isTristate &amp;&amp; state == INTERMEDIATE) state = UNCHECKED; } // LABEL : /** The checkbox label. */ [Bindable] public var label:String; // STATE CHANGE : private var _state:int; /** The current state of the box. */ public function get state():int { return _state; } public function set state(value:int):void { _state = value; switch(_state) { case INTERMEDIATE: if(!_isTristate) throw new Error("Setting state to INTERMEDIATE on a non tristate checkbox !"); tristateImg.visible = true; checkbox.selected = false; break; case UNCHECKED: tristateImg.visible = false; checkbox.selected = false; break; case CHECKED: tristateImg.visible = false; checkbox.selected = true; break; } } /** * Simply sets the state according to the current state. */ protected function changeState(ev:Event):void { if(isTristate) ev.preventDefault(); switch(state) { case INTERMEDIATE: state = CHECKED; break; case UNCHECKED: state = isTristate ? INTERMEDIATE : CHECKED; break; case CHECKED: state = UNCHECKED; break; } } /** * Initial state. */ protected function init():void { state = UNCHECKED; } ]]&gt; &lt;/fx:Script&gt; &lt;fx:Declarations&gt; &lt;!-- Place non-visual elements (e.g., services, value objects) here --&gt; &lt;/fx:Declarations&gt; &lt;s:layout&gt; &lt;s:BasicLayout /&gt; &lt;/s:layout&gt; &lt;s:CheckBox id="checkbox" label="{label}" change="changeState(event)"/&gt; &lt;s:Image id="tristateImg" mouseEnabled="false" mouseChildren="false" source="@Embed('assets/icons/tristate_checkbox.png')" x="2" y="5" /&gt; &lt;/s:Group&gt; </code></pre>
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    1. POIs there a good way to get a tri-state checkbox in flex?
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    1. USDamien Dessagne
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